#include <cmath>

class Solution {
public:
    bool checkPerfectNumber(int num) {
		if (num == 1)
			return false;
		int sum = 1;
		for(int i=2;i<=sqrt(num);++i)
		{
			if (num%i == 0)
			{
				sum += i;
				if (i*i != num)
					sum += num / i;
			}
				
		}
		return num == sum;
    }
};
int main()
{
	
}